Update duckdb index files

.gitattributes

@@ -326,3 +326,4 @@ sinhala/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 sinhala/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 somali/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 somali/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+somali/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

somali/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:4f42eef1b6512bcf8c645d3a3b771e46db524e53786e6c3ae47cd0b42caee2ce
+size 6303744